Oxygen sensor - collar around it??

None of those photos work.

 

Can't find Schley 66750 on Amazon.

 

TEKTON 47749 is the equivalent

 

Interesting but they look nothing alike.

B00GMN4D1Q
and
B000TRLGXE

Amazon links are broken in this forum so you just have to copy and paste the each of those into amazon's search and they will display.

I did found the Schley shortly after my last post and ordered it. It just came 5 minutes ago and surprisingly it fits the O2 sensor perfectly without any modification.

The outer diameter of the socket is 31.3 mm (1.23 inches).

Previous posts indicate the outer diameter of this socket is 1.35 inches so it appears the maker of this socket has changed it slightly to accommodate this wideband o2 sensor.

 

Took the wiper cowl off. See this video:

That took about 10 minutes.

The video doesn't mention the fact that there's a heat shield held on by 4 10mm bolts. Fortunately that came off in about a minute which exposed the bung on the pipe.

Then I sprayed the bung with pb blaster and got ready to wait for a long time and then gear up for battle to get the sensor off.

1 minute after I sprayed with pb blaster, I decided to set the socket and explore how much range I had with my 3/8" driver and whether I'd have enough room for a breaker bar.

So I set the socket on there with my standard 3/8" driver and give it a little tug and it came loose just like that.

So I took a short break to come and post this 15 minutes into my ordeal to change the sensor. I'll post photos later.

 

As mentioned above, the Schley product number is 66750B (with a B at the end), which is a thinner walled version.

After researching a bunch of sockets at various price points, the above product stood out as being the best off the shelf option at a price point I can't say I was happy with, but then I don't have access to a bench grinder.

Though I still haven't had a chance to check this socket for fitment, it should work perfectly for this application.

 

I didn't have to grind my Schley socket. It fit the inside of the sensor heat-shield perfectly.

 

What is the "bung"?

 

Pretty sure they meant the sensor.

Bung - Wikipedia

https://www.thefreedictionary.com/bung

 

I'm curious if anyone who has changed the sensor gained any fuel mileage? The ones that are 10 + years old and 200,000 plus miles on them.

Posted via the PriusChat mobile app.

 

I'm wondering the same.

Here's my salvage yard AF sensor from the donor 2006 that at the yard I found was easiest to remove the whole manifold and take that on down with the rest of the exhaust home with me for now.

I still can't quite see if mine has one installed or not as I don't see the connector connected if does. The as-found "custom exhaust" definitely doesn't have the downstream sensor installed and I've received a new cat to install with the OEM exhaust I noted above.

Here's my custom tool for the AF sensor removal from the manifold (you can ignore the rest after the tool talk, though if you were wondering the gray-silver hood hinge was installed on the 2013):

 

My 2008 Gen 2 recently displayed DTC P0420 (162,000 kms). Car has new Bank 1, 02 Sensor 2 (post cat), new muffler but original cat, spark plugs are squeaky clean, no sign/sound of exhaust leak, no change in mileage. From what I've read in this forum, it sounds like replacing the cat (most common & likely failure) is easier than replacing the A/F sensor Bank 1, Sensor 1 (sensor + tool)... but a lot more expensive.
Q: What is the downside of ignoring the P0420 for a while?
Thanks!

 

IF... "all" that is wrong is that the converter isn't working properly (often the result of oil burning), then the only consequence is that tailpipe emissions will be higher than they should. That and some municipalities frown on emissions faults when (if) they perform inspections.

A problem with fuel control (& the S1 upstream air - fuel sensor) could cause other concerns. Usually that affects MPGs - you would also see abnormal Fuel Trim numbers in scantool data.

Another point though, is that if the check engine light is on all the time, you won't know if another fault occurs (unless it's a misfire that flashes the CEL).

Posted via the PriusChat mobile app.

 

Thanks for the quick reply. Unfortunately (despite hours of effort), I've been unable to get Techstream to 'connect' on a Win 7 or 10 laptop, so I can't read any Fuel Trim data. I erased the ODBII P0420 code... and it hasn't reappeared... yet. I haven't received a more specific code for either of the Bank 1 sensors - and given that a P0420 appears to have have a lot of possible causes - until I can narrow it down, I'm hesitant to just go ahead and replace the cat.

 

How long have you owned the vehicle, and could the odometer have been rolled back?

Reach out if you need assistance in getting it working, as there are some step-by-steps that may help.

With only 100k miles on the vehicle, you could change out the upstream A/F sensor (or test before throwing parts at it), as neither the catalytic or this sensor should've failed at this point. Take the sensor out from the bottom, and have a second person help disconnect the clip from the top (2 person job, and thank you Ray)

Given your location, and before removing the sensor (minutes, hours, days, or multiple sprays), use some penetrating oil on it, which may help with a clean removal, some mechanics have broken off said sensor (or so I've heard). I failed to spray, and it came out like someone didn't torque it at the factory (California car, YMMV).

 

Short Term and Long Term Fuel Trim are part of "standard" OBD2 data. If you have some other device (besides TechStream) that was used to read the P0420, then I might expect it to be able to read OBD2 data as well.

Or read this thread that reviews several scantool apps and devices. Some are limited (but still can be useful), and some are more capable.
https://priuschat.com/index.php?posts/3290690

Posted via the PriusChat mobile app.

 

I bought the 2008 Gen 2 from a neighbour who bought it brand new, and provided me with all receipts, so I'm confident the 160 kms are valid.

 

I have spent entire weekends trying to overcome the “Techstream cannot connect to VIM” problem. I've built a MS Word file w/ 4 pages of notes from just about every tip in this forum, plus multiple YouTube videos. I've run older & newer versions of Techstream on both Windows 7 and 10 laptops; tried different COM ports; moved-around the XHorse Electronics drivers and .dll files into different folders & paths; even tried editing a line of code in the IT3System file (changing TISFunction=1 to 0 in 'Available Function Setting'. No luck... yet.

 

Is there a specific OBDII code for a failing A/F sensor (more specific than the general P0420)? It doesn't sound like it's an easy task to swap-out... not to mention the cost (approx. $295 for the sensor & off-set tool - that I may have to grind-down to fit inside the heat shield around the sensor base).

 

Thanks for the link, I'll check it out. I have an old 'cable' OBDII reader + a bluetooth OBDII reader w/ Torque Pro on a smartphone.... they seems to work OK. Should I be able to get "Short Term and Long Term Fuel Trim" data or a code on Torque?
Thanks again everyone for the help - I couldn't afford to own the Prius if it wasn't for this forum.